A vertical cut is to be made in a soil mass having cohesion c, angle of internal friction ϕ, and unit weight γ. Considering Ka and Kp as the coefficients of active and passive earth pressures, respectively, the maximum depth of unsupported excavation is:

\(\frac{{4c}}{{\gamma \sqrt {{K_p}} }}\)

\(\frac{{2c\sqrt {{K_p}} }}{\gamma }\)

\(\frac{{4c\sqrt {{K_a}} }}{\gamma }\)

\(\frac{{4c}}{{\gamma \sqrt {{K_a}} }}\)

A vertical cut is to be made in a soil mass having cohesion c, angle o

1.	A vertical cut is to be made in a soil mass having cohesion c, angle of internal friction ϕ, and unit weight γ. Considering Ka and Kp as the coefficients of active and passive earth pressures, respectively, the maximum depth of unsupported excavation is:
A.	\(\frac{{4c}}{{\gamma \sqrt {{K_p}} }}\)
B.	\(\frac{{2c\sqrt {{K_p}} }}{\gamma }\)
C.	\(\frac{{4c\sqrt {{K_a}} }}{\gamma }\)
D.	\(\frac{{4c}}{{\gamma \sqrt {{K_a}} }}\)
Answer» E.

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A vertical cut is to be made in a soil mass having cohesion c, angle of internal friction ϕ, and unit weight γ. Considering Ka and Kp as the coefficients of active and passive earth pressures, respectively, the maximum depth of unsupported excavation is:

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